Rebuilt magnum 360 Noise

Rat Bastid said

If you don’t have enough preload you need longer pushrods. If you have too much preload you’d need shorter pushrods.

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How do I deal with that with a non adjustable valvetrain? Custom pushrods? That would really suck. This setup is supposed to work perfectly fine with stock pushrods and lifters. Maybe the lifters just aren't right